JEE Physics - MCQ Practice Questions
Practice free JEE Physics multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.
900 questions | 100% Free
Which of the following materials has the highest temperature coefficient of resistance?
A cell of EMF E and internal resistance r is connected to an external resistance R. The terminal voltage V is given by:
A potentiometer wire of length 100 cm has resistance 10Ω. A standard cell of EMF 1.5V is balanced at 60 cm. What is the EMF of unknown cell if it balances at 80 cm?
The resistivity of a semiconductor at absolute zero is:
A nichrome wire and a copper wire of same length and area are connected in series. Which experiences greater heat dissipation?
In a meter bridge experiment, the null point is obtained at 40 cm from the left end. If the left resistance is 8Ω, what is the right resistance?
The current density in a conductor depends on:
A battery of EMF 10V supplies current to a circuit. If the voltage across external resistance is 9V, what is the internal resistance if external resistance is 90Ω?
In a circuit with capacitors, which quantity is continuous across the capacitor?
The length of a conductor increases by 10% when stretched. Assuming volume remains constant, the resistance increases by approximately:
The equivalent resistance of an infinite ladder network of 1Ω resistors (each rung) is:
A copper wire at 20°C has resistance 100Ω. Its resistance at 120°C is (α for copper = 0.004/°C):
In a carbon resistor, the color bands are Brown-Black-Red-Gold. Its resistance is:
Which of the following shows non-ohmic behavior?
In Joule heating, if voltage is doubled and resistance is halved, the power dissipated becomes:
A superconductor exhibits zero resistance below its critical temperature because:
A wire of length L and cross-sectional area A has resistance R. If the wire is stretched to 1.5 times its original length without change in volume, what will be its new resistance?
Three resistances of 2Ω, 3Ω, and 6Ω are connected in parallel across a 12V battery. What is the total current drawn from the battery?
A heating element rated 1000W, 220V is connected to a 110V supply. The heat produced becomes:
In a Wheatstone bridge, arms P, Q, R, and S have resistances 10Ω, 15Ω, 20Ω, and 30Ω respectively. A galvanometer is connected between junctions of P-Q and R-S. The galvanometer reading will be: